/Engine/Plugins/Runtime/ReplicationGraph/Source/Public/ReplicationGraphTypes.h
Generic flags that describe an actor list. Currently only used for "Default" vs "FastShared" path. These are for unsorted lists that are returned from the graph, merged together, sorted, and finally replicated until bandwidth limit is hit.
enum EActorRepListTypeFlags { Default = 0, FastShared = 1, Max, }